If you buy a new Pajero, it should keep you free of worries for the duration you are planning to use the vehicle if you maintain it well. The only problem with Mitsubishi vehicles is that the spares are costly compared to that of other brands especially Toyota. Prado is no doubt a sturdy car and much sturdier compared to Pajero, but since you are opting to buy a used one, there is nothing much that can be said about its performance. It would depend on the condition of the vehicle.